Blanket-fastening means for impression cylinders



Dec. 10 1929. I L. A. SCHMIDT CYLINDERS Filed July 15, 1927 nnmmmu 2::-

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Patented Dec. 10, 1929 UNITED STATES PATENT OFFICE Ill-OUTS A. SCHMIDT, OF BROOKLYN, NEW YORK, ASSIGNOR TO R. HOE & GO., ING., OF NEW YORK, N. Y., A CORPORATION OF NEW YORK BLANKET-FASTENING MEANS FOR IMPRESSION CYLINDERS Application filed July 15,

This invention relates to certain improvements in means for securing the blanket to the impression cylinder of a printing press.

In certain classes of printing, the impression cylinder, which cooperates with the form cylinder to produce the printing impression on a sheet or web passing therebetween has its surface covered with a resilient blanket of felt or the like so as to produce the desired impression contact. These blankets are removably secured in place and the usual method of doing this is by securing one end of the blanket to a stationary anchor, usually in the form of hooks, which are located with the cylinder and at one side of an openin therein. The other end of the blanket is le around the cylinder and wound on an adjusting rod, the end of the blanket generally being provided with a piece of fabric, such as canvas, which is wound about this rod, Whenthis rod is turned, the blanket is tightened to the desired extent about the surface of the cylinder. The opening or slot in the cylinder forms what is known as the margin space, that is, there will be a space between the two edges of the slot at which no impression will take place, this space forming What is known as the margin space of the cylinder.

To enable the pressman to secure the end of the blanket to the anchor hooks, it is necessary that the slot or opening in the cylinder be of suflicient width so that he can get his fingers or hands through the slot inside the cylinder to secure the blanket in place,- and this requires a slot of considerable width.

lit is the especial'object of the present invention to provide a construction by which a narrow slot may be employed, thus reducing the margin space, and in which the blanket anchoring members'are so arranged that the blanket can be secured in place without the necessity of the pressman getting his hands or fingers in the slot.

A further object of the invention is to produce a simple construction by which the blanket anchoring members may be so positioned that the blanket may be quickly fastened thereto and securely anchored in place within the cylinder.

With these and other objects not specifi- 1927. Serial No. 205,915. 7

. cally referred to in view, the inventions conshowing the blanket anchoring means in one 1 position;

Figure 2 is a similar view showing the blanket anchor in place, and

Figure 3 is a side sectional view of the construction shown in Figure 1, the view being taken in the'direction of arrow 3 of that figure.

Referring now to these drawings, the impression cylinder is marked 1, this cylinder being supported on a shaft 2, as is usual, supported in suitable bearings, not illustrated. This cylinder is provided with a recess 3 for receiving the blanket securing mechanisms, and this recess terminates in a narrow slot or opening 4 in the walls 5 of the cylinder, this opening being the width of the desired margin space and, as usual, extending the impression length of the cylinder.

Means are provided in accordance with the present invention for firmly anchoring one end of the blanket, these means bein such that they can be projected into the slot, so that the blanket may be readily attached thereto, and preferably these means are operable by agencies located outside the cylinder. Thus the desired narrow slot may be provided. The specific construction and arrangement of these means may, of course, be widely varied. I

In the particular construction shown, however, there is provided a bar or rod 6 rotatably mounted at one end in the cylinder wall and at the other end in aplate 7 secured to the end of the cylinder in any suitable manner, as by bolts 8,, this plate also acting to close the recess 3, before referred to. Mounted at suitable intervals on this bar are a series of blanket holders shown in the form of pins 9 havin hooked ends 10 'over which the blanket mayie hooked. The normal position of the parts is that shown in Figure 2. Means are provided for projecting these hooks into the slot 4 toward the periphery of the cylinder and, in the best construction, these means are rotary means operated from outside the ends of the cylinder. As shown, therefore, the end of the rod'is formed with a squared end 11- for the reception of a wrench or other suitable tool, by which the rod may be rotated. The rod is held against rotation by a ratchet 12 with which cooperates a spring pressed pawl 13. In the best constructions, means are provided to prevent the rod from springing when it is put under stress by tightening up the blanket and, in the construction illustrated, these means are in the form of stop pins 14 secured in the cylinder wall and projecting into the recces 3 so as to engage with the rod.

The blanket or packing, in the particular construction illustrated, is a three-ply blanket having one ply 15 0f soft rubber or the like, a second ply 16 of hard felt or the like, and an outer covering 17 of muslin. These three parts of the blanket are hooked over the hooks 10 when the parts are in the position shown in Figure 1. The rod is then rotated to the position shown in Figure 2 and is held by the pawl, this forming the anchor or dead end of the blanket. The other end of the blanket is adjustably secured, and the means for thus adjustably securing the blanket may be varied within considerable limits.

In the particular construction shown, where a three-ply blanket is employed, the ply 15 is simply tucked around the edge of the slot and the part 16 is wound about a roll 18 suitably mounted at one end in the cylinder and at the other end in the plate 7, before referred to, this roll being provided with a squared end 19, outside the end of the cylinder, by which it may be rotated, backward rotation of the roll being prevented by a ratchet 20 and a pawl 21. The muslin ply 17 of the blanket is secured around a second rod or roll 22, also mounted at one end of the cylinder wall and in the plate 7, this roll being provided with a squared end 23 by which it may be manipulated from outside the cylinder, rearward movement of this roll being prevented by a ratchet 24 and a pawl 25. The

pawls 21 and 25 are preferably spring pressed, a single spring 26, secured to a bracket 27, being used for actuating'both the pawls.

With the construction described it will-be seen that a very convenient means has been provided for securing the dead end of the blanket, means which may be readily manipulated so that the blanket may be quickly placed in position, and one in which a Very narrow slot may be used.

While the invention has been shown and described in its preferred form, it will be understood that various changes may be made in the specific construction and arrangement of the parts without departing from the invention as defined in the appended claims.

What I claim is:

1. The combination of an impression-cylinder having a narrow margin slot, means for adjustably securing one endof a blanket inside the cylinder, a rod mounted in the cylinder, blanket holding projections carried by the rod, to which the other end of the blanket may be directly secured, and means for rotating the rod to cause the projections to approach near to the surface of the cylinder and recede from the surface of the cylinder.

2. The combination of an impression cylinder having a margin slot, means for adjustably securing one end of a blanket inside the cylinder, a rod mounted in the cylinder, blanket holding projections carried by the rod, means for rotating the rod to cause the projections to approach and recede from the slot, and means for preventing the springing of the rod under blanket tension.

3. The combination of an impression cylinder having a narrow margin slot, means for adjustably securing one end of a blanket inside the cylinder, a rod to which the other end of the blanket may be directly secured mounted in the cylinder, blanket holding projections on the rod, means for rotating the rod to cause the projections to move from a position within the cylinder to a position accessible from outside the cylinder for securing the blanket and to recede within the cylinder, and means for holding the rod in adjusted position.

4. .The combination of an impression cylinder having a margin slot, means for adjustably securing one end of a blanket inside the cylinder, a rod mounted in the cylinder, blanket holding projections carried by the rod, means for rotating the rod to cause the projections to approach and recede from the slot, stops engaging the rod to prevent springing under blanket tension, and means for holding the rod in adjusted position.

5. The combination of an impression cylinder having a narrow margin slot, means for adjustably securing one end of a blanket inside the cylinder, a rod mounted in the cylinder, blanket holding hooks carried by the rod, to which the other end of the blanket may be directly secured, and means lo- ,cated outside the cylinder for manipulating the rod to cause the hooks to move to a position accessible from outside the cylinder for securing the blanket and to recede within the cylinder after the blanket is secured thereto.

In testimony whereof, I have hereunto set my hand.

LOUIS A. SCHMIDT. 

